Here’s mine from just one bud. For this reason, I’m hesitant to put one in the tank regardless what what designer name one may give it. At first it was “cool, I got another one” then it’s more troublesome to remove because it’s wiping out your corals.
You can see some of the bottom ones elongated their column to reach for something/light. Not as slender as yours but you get the idea.
I used to have corals on those rocks.